L-theanine and caffeine ratio calculator
pick your drink, count your servings, choose a ratio. you get the caffeine, the l-theanine that matches it, and how many pieces of nula calm gum that is. every caffeine number below links to where it came from.
why 1:1 or 2:1
there is no single established ratio. the trials pair roughly 1 to 2.5 parts l-theanine with 1 part caffeine: 200 mg with 160 mg (nawarathna 2025), 250 mg with 150 mg (haskell 2008), 100 mg with 50 mg (owen 2008) and 97 mg with 40 mg (giesbrecht 2010).
1:1 is the simple starting point and sits nearest the newest trial. 2:1 matches the older trials, which used less caffeine. payne and colleagues (2025) review the wider research on tea, l-theanine and the pair together.
caffeine per drink, and where each number comes from
usda numbers are caffeine per 100 g times the gram weight usda lists for that serving. real drinks vary a lot by bean, brew, size and brand, so if your label says something else, use something else (enter mg) in the calculator.
| drink | caffeine | serving | source |
|---|---|---|---|
| drip coffee | ~95 mg | 8 fl oz cup | USDA FoodData Central (SR Legacy 171890): 40 mg per 100 g × 237 g |
| espresso | ~63 mg | 1 shot (1 fl oz) | USDA FoodData Central (SR Legacy 171891): 212 mg per 100 g × 29.6 g |
| cold brew | ~207 mg | 12 fl oz (355 mL) | Lane and colleagues (2017): mean of five batches, 207.22 ± 39.17 mg per 355 mL |
| black tea | ~47 mg | 8 fl oz cup | USDA FoodData Central (SR Legacy 173227): 20 mg per 100 g × 237 g |
| green tea | ~29 mg | 8 fl oz cup | USDA FoodData Central (SR Legacy 171917): 12 mg per 100 g × 245 g |
| energy drink | ~144 mg | 16 fl oz can | USDA FoodData Central (FNDDS 2710756): 29 mg per 100 g × 496 g |
| pre-workout | ~254 mg | 1 scoop (label serving) | Jagim and colleagues (2019): average across the top 100 products (86% contained caffeine), 254.0 ± 79.5 mg |
for range, the fda gives these per 12 fl oz: regular brewed coffee 113–247 mg, black tea 71 mg, green tea 37 mg, energy drinks 41–246 mg.
safety first
- for most healthy adults, the fda cites 400 mg of caffeine a day as an amount not generally associated with negative effects. that is about four 8 fl oz cups of drip coffee.
- the fda says toxic effects, like seizures, can show up with rapid intake of around 1,200 mg, and warns about pure and highly concentrated caffeine powders and liquids.
- pregnant, trying to get pregnant, breastfeeding, under 18, sensitive to caffeine, or on medication? ask your doctor before you change your caffeine or add a supplement.
- l-theanine does not cancel caffeine. it does not make a high dose safe.
- nula suggested use: chew 1–2 pieces as needed, for at least three minutes. do not exceed 4 pieces a day.
this tool is a guide, not medical advice, and not a diagnosis or treatment of any condition.
where nula fits
nula calm gum is 100 mg l-theanine + 50 mg gaba per serving (1 piece). it is caffeine-free, so the caffeine side of the ratio is all yours.
with your morning coffee, one or two pieces puts you in the studied range. at 4pm when you are already wired, skip the second coffee and chew nula on its own. no ratio needed.
common questions
what ratio of l-theanine to caffeine should i use?
there is no single established ratio. trials have paired roughly 1 to 2.5 parts l-theanine with 1 part caffeine: 200 mg with 160 mg, 250 mg with 150 mg, 100 mg with 50 mg, and 97 mg with 40 mg. 1:1 is the simple place to start; 2:1 matches the older, lower-caffeine trials.
how much caffeine is in a cup of coffee?
usda fooddata central puts brewed coffee at about 95 mg per 8 fl oz cup. the fda gives 113 to 247 mg for a 12 fl oz regular brewed coffee. café sizes are often bigger than 8 fl oz, so check the menu.
how many pieces of nula go with one coffee?
one. a piece of nula calm gum has 100 mg l-theanine, close to 1:1 with an 8 fl oz drip coffee. two pieces is closer to 2:1.
does l-theanine cancel out caffeine?
no. l-theanine is not a caffeine blocker. it changes how the stimulation feels for some people, but the caffeine still counts toward your day.
is this medical advice?
no. it is arithmetic on published numbers. the fda cites 400 mg of caffeine a day for most healthy adults. if you are pregnant, trying to get pregnant, breastfeeding, under 18, have a heart condition or take medication, ask your doctor first.
can i link to or share this calculator?
yes, please. copy the link snippet on this page. it is free to use and there is nothing to sign up for.
link to this tool
writing about coffee, tea, focus or supplements? you are welcome to link to the calculator. paste this where you want the credit to show.
sources
- USDA FoodData Central (SR Legacy 171890). Beverages, coffee, brewed, prepared with tap water. U.S. Department of Agriculture.
- USDA FoodData Central (SR Legacy 171891). Beverages, coffee, brewed, espresso, restaurant-prepared. U.S. Department of Agriculture.
- Lane and colleagues (2017). Can Cold Brew Coffee Be Convenient? A Pilot Study For Caffeine Content in Cold Brew Coffee Concentrate Using High Performance Liquid Chromatography. The Arbutus Review.
- USDA FoodData Central (SR Legacy 173227). Beverages, tea, black, brewed, prepared with tap water. U.S. Department of Agriculture.
- USDA FoodData Central (SR Legacy 171917). Beverages, tea, green, brewed, regular. U.S. Department of Agriculture.
- USDA FoodData Central (FNDDS 2710756). Energy Drink. U.S. Department of Agriculture.
- Jagim and colleagues (2019). Common Ingredient Profiles of Multi-Ingredient Pre-Workout Supplements. Nutrients.
- U.S. Food and Drug Administration (2024). Spilling the Beans: How Much Caffeine is Too Much? FDA Consumer Updates.
- Nawarathna and colleagues (2025). High-dose L-theanine-caffeine combination improves neurobehavioural and neurophysiological measures of selective attention in acutely sleep-deprived young adults: a double-blind, placebo-controlled crossover study. The British Journal of Nutrition.
- Haskell and colleagues (2008). The effects of L-theanine, caffeine and their combination on cognition and mood. Biological Psychology.
- Owen and colleagues (2008). The combined effects of L-theanine and caffeine on cognitive performance and mood. Nutritional Neuroscience.
- Giesbrecht and colleagues (2010). The combination of L-theanine and caffeine improves cognitive performance and increases subjective alertness. Nutritional Neuroscience.
- Payne and colleagues (2025). Effects of Tea (Camellia sinensis) or its Bioactive Compounds l-Theanine or l-Theanine plus Caffeine on Cognition, Sleep, and Mood. Nutrition Reviews.
These references describe caffeine content and research on the ingredients, not on Nula Calm Gum. Last reviewed November 3, 2026.
l-theanine 100mg · gaba 50mg · caffeine-free
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